Oliver 1850 Ertl Toy in pink

I have acquired an Oliver 1850 toy tractor made by Ertl. It is pink in color and was told that this was made as part of a promotion regarding power and tractor power.

Research seems to indicate that Ertl produced the 1850 toy tractors in 1965. Does anyone know anything about this promotion and when it happened, and whether my information may be true? I can't seem to find information on this.

At some point in the 60's Oliver introduced a new plow which they marketed as "the color blind plow" (basically marketing to IH, JD, Ford, MF and all other brand farmers). So they painted an oliver 1850 Cadillac Pink and used it to demonstrate the plow.